When a thin interfacial layer reconfigures macroscopic flow.
🔗 https://journals.aps.org/prfluids/abstract/10.1103/hcyb-7nhz
#InterfacialPhysics #Hydrodynamics #NonlinearDynamics #Multiphase
#hydrodynamics
🌊 Open-source software advances design of offshore structures by testing wave-structure interactions
https://techxplore.com/news/2025-10-source-software-advances-offshore-interactions.html
#software #cornell #research #opensource #oceans #waves #hydrodynamics #simulation #engineering
An aircraft that can reduce fuel burn by over 60% by using "laminar-flow aerodynamics" (as well as other technologies like "precision all-carbon-fiber composites") has been produced, or so it is claimed, by an aerospace startup company, Otto Aerospace, which announced its first fleet customer will be Flexjet, although deliveries won't begin until 2030.
https://ottoaerospace.com/news/otto-aerospace-secures-historic-300-aircraft-order-with-flexjet/
Check out this absolute stonker of a figure by Philippe Delache in 1977.
(I originally found the figure reproduced in the textbook Turbulence by Uriel Frisch. I have it hanging on my office wall...)
This post inspired by @grimalkina talking about hiking and flow(s) in a totally different context.
Galiliean-invariant cosmological hydrodynamical simulations on a moving mesh
https://wwwmpa.mpa-garching.mpg.de/~volker/arepo/
#HackerNews #GalilieanInvariant #CosmologicalSimulations #MovingMesh #Hydrodynamics #Astrophysics
Weekly Update from the Open Journal of Astrophysics – 24/05/205
It’s time once again for the regular Saturday update of papers published during the past week at the Open Journal of Astrophysics. Since the last update we have published three new papers, which brings the number in Volume 8 (2025) up to 62 and the total so far published by OJAp up to 297.
In chronological order of publication, the three papers published this week, with their overlays, are as follows. You can click on the images of the overlays to make them larger should you wish to do so.
The first paper to report is: “Jet-shaped filamentary ejecta in common envelope evolution” by Ron Schreier, Shlomi Hillel and Noam Soker (Technion, Haifa, Israel). This paper, which was published on Monday May 19th 2025 in the folder High-Energy Astrophysical Processes, presents three-dimensional hydrodynamical simulations of common envelope evolution of a neutron star inside the envelope of a rotating red supergiant with Rayleigh-Taylor instabilities forming filamentary ejecta.
The overlay is here:
You can find the officially accepted version on arXiv here.
Second one up is “Weighing The Options: The Unseen Companion in LAMOST J2354 is Likely a Massive White Dwarf” by M. A. Tucker, A. J. Wheeler & D. M. Rowan (Ohio State University, USA) and M. E. Huber (U. Hawaii, USA). This paper was published on Tuesday 20th May 2025 in the folder for Solar and Stellar Astrophysics. It discusses a spectroscopic study of the binary system LAMOST J235456.73+335625 (J2354) with a discussion of the implications for the nature of the dark component.
The overlay is here:
You can find the officially-accepted version of the paper on arXiv here.
The third and last paper of the week, published on Thursday May 22nd 2025, also in the folder Solar and Stellar Astrophysics, is “How to use Gaia parallaxes for stars with poor astrometric fits” by Kareem El-Badry (Caltech, USA). This paper presents a method for extracting reasonable estimates of stellar parallaxes from Gaia data when the overall astrometric solution is unreliable due to errors and noise
Here is the overlay:
You can find the officially accepted version of this paper on arXiv here.
That’s all the papers for this week. Looking at the publishing workflow, I expect we will pass the 300 mark next week. We’ll see when I post the next update next Saturday.
#arXiv240719004v2 #arXiv250109663v3 #arXiv250411528v2 #astrometry #binaryStars #commonEnvelopeEvolution #DiamondOpenAccess #GAIA #HighEnergyAstrophysicalPhenomena #hydrodynamics #LAMOSTJ2354 #LAMOSTJ23545673335625 #OpenJournalOfAstrophysics #parallax #SolarAndStellarAstrophysics #stars #TheOpenJournalOfAstrophysics #whiteDwarfs
Kolk (vortex) (Oceanography 🌊)
A kolk is an underwater vortex causing hydrodynamic scour by rapidly rushing water past an underwater obstacle. High-velocity gradients produce a high-shear rotating column of water, similar to a tornado. Kolks can pluck multiple-ton blocks of rock and transport them in suspension for kilometres. Kolks leave clear evidence in the form of kolk lakes, a kind...
Mesmerising wave patterns blown by the Bora (a strong wind blowing from the mountains down to the sea) on the coast in front of Miramare near #Trieste. So cool! #science #physics #hydrodynamics
@logicable The question is so ill defined that the answer is obviously 'yes'. :-)
Rivers aren't straight and so flow in a continuum of differing directions simultaneously.
Even a totally straight river/canal can be flowing normally out to sea when a sudden high tide or wave causes one end of it to flow briefly 'the wrong way'.
What is the question intended to mean?
#maths #rivers #hydrodynamics #logic
(Here's a picture of the Thames flowing both North and South - as is normal.)
Vortex Trapping Of Suspended Sand Grains Over Ripples
--
https://doi.org/10.1029/2023JF007620 <-- shared paper
--
“KEY POINTS
• Observations of vortex-trapped grains suggest delayed settling of advected grains, as well as delayed advection of grains mobilized from the bed
• Quantitative comparisons of vortex-trapped sand grains compared well with theoretical formulations by Nielsen (1992, https://doi.org/10.1142/1269) for a forced vortex
• Improved understanding of vortex trapping effects on sediment dynamics may decrease uncertainty in large-scale coastal model predictions..."
#spatial #model #modeling #water #hydrology #hydrodynamics #vortex #sand #sediment #transport #sedimentation #sedimentology #morphodynamics #fluiddynamics #ripples #coast #coastal #research #velocimetry #suspension #experimentation #dynamics #geology #processes #geomorphology #geomorphometry #vortextrapping #sand #grains #flow #ripple #sandwaves #ripples
ICB
Marshall Graybill in the #lab. He is working on a system to test the #hydrodynamics of denticle surfaces on robotic fins, which he and Nicole Xu aim to publish over the upcoming months as a #research article following their ICB review.
Experimental Studies of #Bioinspired #Shark #Denticles for Drag Reduction
Marshall T Graybill, Nicole W Xu
Thomsen River Estuary, Banks Island [NASA Earth Observatory Daily Image]
--
https://earthobservatory.nasa.gov/images/147560/thomsen-river-estuary-banks-island <-- link to NASA Earth Observatory image
--
[photos in the main from 2015]
#GIS #spatial #mapping #remotesensing #OLI #hydrology #water #sediment #arctic #ocean #climatechange #ArcticOcean #landsat #landsat8 #BanksIsland #Aulavik #ice #snow #permafrost #tundra #Canada #ThomsenRiver #estuary #sedimentation #erosion #braiding #braided #hydrodynamics #geochemistry #geology #acidification
@nasa
Understanding the force interaction between the underwater walker and the substrate may lead to better understanding of the #evolution, #ecology, and #biomechanics of underwater walking."
by
Gamel, Pinti, Astley
Lake Wānaka Mapped In Exquisite Detail [topobathy, New Zealand]
--
https://niwa.co.nz/news/lake-wanaka-mapped-exquisite-detail <-- shared technical article
--
#GIS #spatial #mapping #hydrospatial #bathymetry #remotesensing #LakeWanaka #Wanaka #NewZealand #topobathy #lake #floor #water #hydrology #survey #underwater #geology #geomorphometry #earthquake #fault #faulting #NIWA #lakebed #glacial #glacier #multibeam #echosounder #3dmodel #waterquality #landuse #freshwater #nutrients #sediment #sedimentation #climatechange #model #modeling #catchments #hydrodynamics
@niwa_nz
#WomenAndGirlsInScience SPOTLIGHT DAY 3!
Anastasia Selini has already studied a variety of topics: mosasaur #hydrodynamics, Devonian #shark teeth histology and early tetrapod limb bone microanatomy.
She is a Master's student at the University of Lille who has recently joined the FunMorph lab for her Master's thesis. She will investigate the inertial properties of the equid limb through an evolutionary perspective.
Our work about bubble clouds from plunging jets make the front cover of volume 978 of Journal of Fluid Mechanics!
https://doi.org/10.1017/jfm.2024.12
#Science #physics #Fluids #hydrodynamics #coverJFM
Congrats to our Phd student Narendra Dev!
Further details:
Narendra Dev, J. John Soundar Jerome, Hélène Scolan, Jean-Philippe Matas, Liquid inertia versus bubble cloud buoyancy in circular plunging jet experiments Journal of Fluid Mechanics (2024), Volume 978, A23 https://doi.org/10.1017/jfm.2023.1019
After admitting defeat, we send it to Phys Rev Fluids and I'm super happy that Prof. Howard Stone accepted it right away without sending it to further reviewers.
In the paper we discuss the dewetting instability of a thin liquid film on a switchable substrate. We actually found a cool metastable rivulet state.
Here is the link to the publication: https://journals.aps.org/prfluids/abstract/10.1103/PhysRevFluids.8.L122001
ICB
Performance Surface Analysis Identifies Consistent Functional Patterns across 10 #Morphologically Divergent #Terrestrial #Turtle Lineages
by Stayton
https://doi.org/10.1093/icb/icz072
IOB
"Based on observations in #turtles and comparisons to other #vertebrates, a hypothetical framework that implicates functional interactions in the origination of novel #musculoskeletal traits is presented..."
by Cordero
In 1738, Daniel Bernoulli discovered the principle that increasing the flow of a gas or liquid decreases its pressure. #Poetry #Science #History #Hydrodynamics #Bernoulli (https://sharpgiving.com/thebookofscience/items/p1738.html)
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